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WASHINGTON — The Federal Aviation Administration on Friday replaced three top managers in the nation's air traffic control system following embarrassing incidents of controllers sleeping on the job and making potentially dangerous mistakes.

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In a shake-up of the system, new managers were appointed to key positions that oversee the operation of airport towers and regional radar centers that handle planes flying at high altitudes as well as approaches and departures, the agency said in a statement. A new manager was also appointed to run a regional radar center near Cleveland. The previous managers are being reassigned.

The performance of mid-level managers is also being reassessed, the FAA said. And teams of experts are examining several of the agency's more complex facilities, including the Cleveland center and on Long Island in New York, to ensure agency policies are being followed and professional standards upheld.

Earlier this month, a controller working an overnight shift at the Cleveland center was suspended for watching a DVD movie while he was supposed to be directing air traffic. In February, a supervisor at the Long Island center complained that controllers on late night shifts routinely took naps during breaks and played electronic games when traffic was light.

On Wednesday, FAA replaced the acting manager of a regional radar facility in Warrenton, Va., that handles approaches and departures for airports in Virginia and Maryland. The action came a week after a controller at the facility allowed a plane carrying first lady Michelle Obama and Jill Biden, wife of Vice President Joe Biden, to fly less than three miles behind a much larger military cargo jet as the planes approached Andrews Air Force Base in Maryland.

FAA regulations require a separation of at least five miles when the plane in the lead is significantly larger to prevent the trailing plane from encountering dangerous wake turbulence. Controllers at Andrews also directed Obama's plane to abandon its landing and circle the air base to give the cargo jet time to get off the runway.

Also Friday, FAA named a five-member review panel composed of internal, labor, industry and academic safety experts to evaluate the agency's training of new controllers.

"This is just the beginning of the process to make sure we have the best possible team in place," Transportation Secretary Ray LaHood said.

The changes are part of a comprehensive review that LaHood and FAA Administrator Randy Babbitt promised after a series of incidents that have embarrassed the agency, made controllers the butt of jokes by late night comedians, and raised public jitters about the safety of flying.

Since late March, the FAA has disclosed five incidents of controllers sleeping on the job. Three of those controllers have been fired, while two others and a manager involved in the incidents have been suspended. In one case, a plane transporting a critically ill patient had to circle Reno-Tahoe International Airport because the pilot was unable to reach the lone controller working an overnight shift in the tower. In another, two airliners landed at Reagan National airport near Washington without control tower assistance because the lone controller on duty at midnight had fallen asleep.

The controller who watched the movie in Cleveland and a manager at that center also have been suspended. So have two controllers at an airport tower in Lubbock, Texas, who were unreachable for a period of time while working an overnight shift.

Another controller was suspended for actions that allowed a Southwest Airlines jet with 142 people aboard within about 500 feet of a small plane about 11,000 feet over central Florida.

The top FAA official overseeing air traffic operations — Hank Krakowski — resigned two weeks ago amid an uproar over the sleeping incidents.

Actions previously ordered by Babbitt to address safety concerns include the addition of a second controller on overnight shifts at 27 airports and a radar center, including Reagan National and Reno-Tahoe, and changes to controllers' work schedules.

However, Babbitt and LaHood have ruled out allowing controllers to nap while on breaks during their work shifts. Scientists have recommended naps on overnight shifts during the hours when the human body naturally craves sleep as a means to help keep controllers alert when they return to their duties. FAA policies prohibit controllers from sleeping during work shifts, even during breaks.

The National Air Traffic Controllers Association, the union representing FAA's 15,700 controllers, declined to comment on the management changes. Paul Rinaldi, president of the controllers' association, and Babbitt have been visiting air traffic facilities to hear from controllers and to underscore that professional standards should be maintained.

However, Rinaldi has said he intends to press FAA to implement the recommendations of a working group made up of FAA and labor officials on controllers suffering from fatigue. The working group recommended controllers be allowed to nap during breaks.

Copyright 2011 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.

Video: Despite scrutiny, ATC errors abound

Closed captioning of: Despite scrutiny, ATC errors abound

>>>we have news from the world of aviation. again tonight, just days after the transportation department promised to fix problems in this country's
air traffic control
towers, there are two high-profile incidents to report tonight. first, the first lady's aircraft, an
air force
modified 737, was forced to abort its landing and then circle around
andrews air force base
yesterday after a controller error brought the official
white house
aircraft too close to a giant lumbering c-17 cargo jet that was landing in order in front of the first lady's plane. we should add, in the aviation business these are known as go-arounds. they're not entirely uncommon at busy airports. obviously less common on flights like this one. they're usually caused by a preponderance of caution combined with a miscalculation by pilots or the tower regarding air or
ground speed
. and a night shift controller in ohio has been suspended for watching a movie while on duty. he left his radio key open and was inadvertently transmitting a scene from a
samuel l. jackson
movie called "cleaner" to pilots passing overhead in the
air space
. after complaints that the controller couldn't be reached, an
air force
pilot got through on a
military radio
frequency.